Hello & welcome....as you already know - you've come to a great place w/wonderful people that are always there to help. As you also know - your going to get a zillion opinions on what is 'the best'. Whatever you chose, there will be another one waiting in the wings.
Don't feel you overpaid for your wife's setup; you can't put a high enough price on health, therefore you didn't overpay - you made a great investment. Best of luck to the both of you & hope to see you here often.
I agree with moishesmom and couldn't have said it better. Health is most important, lungs are more expensive than vaping; although some ECF members may have already spent way more than a lung would cost